Hybrid cluster proteins in a photosynthetic microalga

The FEBS Journal
Robert van LisAriane Atteia

Abstract

Hybrid cluster proteins (HCP) are metalloproteins characterized by the presence of an iron-sulfur-oxygen cluster. These proteins occur in all three domains of life. In eukaryotes, HCPs have so far been found only in a few anaerobic parasites and photosynthetic microalgae. With respect to all species harboring an HCP, the green microalga Chlamydomonas reinhardtii stands out by the presence of four HCP genes. The study of the gene and protein structures as well as the phylogenetic analyses strongly support a model in which the HCP family in the alga has emerged from a single gene of alpha proteobacterial origin and then expanded by several rounds of duplications. The spectra and redox properties of HCP1 and HCP3, produced heterologously in Escherichia coli, were analyzed by electron paramagnetic resonance spectroscopy on redox-titrated samples. Both proteins contain a [4Fe-4S]-cluster as well as a [4Fe-2O-2S]-hybrid cluster with paramagnetic properties related to those of HCPs from Desulfovibrio species. Immunoblotting experiments combined with mass spectrometry-based proteomics showed that both nitrate and darkness contribute to the strong up-regulation of the HCP levels in C. reinhardtii growing under oxic conditions. The link ...Continue Reading

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Citations

Jul 28, 2020·Plants·Carmen M Bellido-PedrazaAurora Galván
Jan 9, 2021·Plant Molecular Biology·Robert van LisAriane Atteia

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